[FastTokenizer] Fix ernie 3.0 of fast_tokenizer deadlink (PaddlePaddle#5116)

* fix ernie 3.0 deadlink

* Update link

Author: joey12300

fast_tokenizer/docs/cpp/README.md

@@ -66,6 +66,6 @@ fast_tokenizer
 
 目前 FastTokenizer 提供了以下 C++ 使用示例。
 
-[ErnieFastTokenizer C++示例](../../examples/ernie/README.md)
+[ErnieFastTokenizer C++示例](../../examples/ernie-3.0/README.md)
 
 [ClipFastTokenizer C++示例](../../examples/clip/README.md)

fast_tokenizer/examples/ernie-3.0/README.md

@@ -12,8 +12,9 @@ FastTokenizer库在C++、Python端提供ErnieFastTokenizer接口，用户只需
 
 ## 详细分词示例文档
 
-[C++ 分词示例](./cpp)
-[Python 分词示例](./python)
+[C++ 分词示例](./cpp/README.md)
+
+[Python 分词示例](./python/README.md)
 
 ## 参考文献